Being a gardener and farmer, I may be able to add a bit to these ideas (although I think @Robert did a pretty dang good job of laying it all out).
Uproot intrigued me from the jump. It sounds destructive, but potbound plants need to be uprooted and placed in fresh, fertile soil in a larger container where its roots can develop. The part of the plant above the soil can only grow as far as the roots can expand below. Same goes for a plant growing in an unfavorable area. You want to move it to a location where it can thrive (better light, soil, drainage, etc.). Plants can’t move themselves, if a plant is growing in an unfavorable place, or the conditions change ( flooding, overgrowth, etc.) we have to do it for them. Although I am more intrigued as to how that could be applied to non-plants, both animate and inanimate (Imagine uprooting a mountain). I really like the treent idea. Expect to find walking, talking, singing foliage sprouting up around my cave.
Decay, same thing. Most think of decay as a negative, but anyone who’s ever had a compost pile or worm farm (or mushroom farm) knows better. Decay is your best friend. Controlling decay, its rate as well as its composition, could absolutely work both ways. But balance is like what Mufasah described, the circle of life and all that. Cheesy, but true. Decay is about breaking things down into their components, until eventually you get back down to just carbon. The essence, the source, the prima materia. That becomes rich nutrient for new life, so something new can be created and nurtured.
Mend, I immediately think of pruning and grafting. Pruning, though harsh, is necessary for the health and proper growth of the plant. Nature prunes in its own way with winds and lightning and fire. But it can be an opportunity as well. Grafting can produce amazing things, even all new species in some cases. But mend would absolutely about providing proper conditions for healing to take place, and finding ways to improve and accelerate that healing. (We have the technology, we can make you faster, better stronger…) Ultimately it’s about restoring integrity, wholeness, making things right again after they’ve gone “wrong”.
I like charm and deception and take it exactly as @Robert does, camouflage. It reminds me of throwing glamours. Of course it can be used for bad deeds, anything can. It’s all about intention. Intention is EVERYTHING in magic. Think of a hunter blending herself into the undergrowth, or you might disguise her prey as something else in order to protect it from her arrow. Charm, same thing, the snake charmer bidding the snake to dance by swaying hypnotically until the snake sways the same way.
Bestiary arts is where I veer off a bit. I agree with the animal tending and caring, and I do like the idea of being able to make beneficial “modifications”. I also see it like warging ( dunno if I’m allowed to make GOT references here, but I’m gonna). At the very least being a sort of animal whisperer, but ultimately going way beyond. A shepherd not needing to stay out in the field because he can direct the flock with his mind. Or redirecting a wolf or bear from attacking you and instead persuading it to help you. Or (again GOT references) being able to fly a dragon and direct its fire power.
And really? You wouldn’t want to make Bubbles just an eensy bit smarter? If only to keep its little head from exploding the next time you want to have a discussion about inter-dimensional travel.